//go:build !linux

package host

import (
	"errors"
	"os"
	"time"
)

// The floor files are written by root's apply and the agent, both of which
// run on a Linux box only (see systemapply_other.go). Off Linux every
// operation refuses, like openBeneath.

type movesDir struct{}

func openMovesDir(root string, create bool) (*movesDir, error) { return nil, errSystemUnsupported }

func (d *movesDir) Close() {}

func (d *movesDir) Lock() error { return errSystemUnsupported }

func (d *movesDir) lockNamed(string, time.Duration, error) error { return errSystemUnsupported }

func (d *movesDir) unlockRemoving() error { return errSystemUnsupported }

func (d *movesDir) WriteDurable(name string, data []byte, mode os.FileMode) error {
	return errSystemUnsupported
}

// floorLockCannotExist: off Linux the lock never exists (openMovesDir
// refuses), and neither can a floor.
func floorLockCannotExist(err error) bool { return errors.Is(err, errSystemUnsupported) }